Split-gate nonvolatile semiconductor memory device
First Claim
Patent Images
1. A nonvolatile semiconductor memory device, comprising:
- a floating gate configured to be provided on a channel region of a semiconductor substrate through a first insulating layer;
an erasing gate configured to be provided on said floating gate through a second insulating layer; and
a control gate configured to be provided beside said floating gate and said erasing gate through a third insulating layer,wherein said floating gate is U-shaped.
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Abstract
A nonvolatile semiconductor memory device includes a floating gate; an erasing gat; and a control gate. The floating gate is provided on a channel region of a semiconductor substrate through a first insulating layer. The erasing gate is provided on the floating gate through a second insulating layer. The control gate is provided beside the floating gate and the erasing gate through a third insulating layer. The floating gate is U-shaped.
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Citations
17 Claims
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1. A nonvolatile semiconductor memory device, comprising:
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a floating gate configured to be provided on a channel region of a semiconductor substrate through a first insulating layer; an erasing gate configured to be provided on said floating gate through a second insulating layer; and a control gate configured to be provided beside said floating gate and said erasing gate through a third insulating layer, wherein said floating gate is U-shaped. - View Dependent Claims (2, 3, 4, 12, 13)
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5. A nonvolatile semiconductor memory device, comprising:
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a floating gate configured to be provided on a channel region of a semiconductor substrate through a first insulating layer; an erasing gate configured to be provided on said floating gate through a second insulating layer; and a control gate configured to be provided beside said floating gate and said erasing gate through a third insulating layer, wherein said floating gate includes; a bottom surface portion configured to contact with said first insulating layer, a first side portion configured to be connected to one end of said bottom surface portion at one end, and extend toward a direction away from a surface of said semiconductor substrate, and a second side portion configured to be connected to the other end of said bottom surface portion at one end, and extend toward said direction away from said surface of said semiconductor substrate. - View Dependent Claims (6, 7, 8, 14, 15)
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9. A nonvolatile semiconductor memory device, comprising:
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a floating gate configured to be provided on a channel region of a semiconductor substrate through a first insulating layer; an erasing gate configured to be provided on said floating gate through a second insulating layer; and a control gate configured to be provided beside said floating gate and said erasing gate through a third insulating layer, wherein said floating gate is L-shaped. - View Dependent Claims (10, 11, 16, 17)
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Specification